{"id":"CVE-2026-4426","title":"A flaw was found in libarchive","summary":"A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwe":["CWE-1335"],"vendor":"libarchive","product":"libarchive","affected":["libarchive","hardened_images","openshift_container_platform = 4.0","enterprise_linux = 6.0","enterprise_linux = 7.0","enterprise_linux = 8.0","enterprise_linux = 9.0","enterprise_linux = 10.0"],"published":"2026-03-19","updated":"2026-08-21","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-4426","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:8944","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-4426","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2449010","label":"secalert@redhat.com"},{"url":"https://github.com/libarchive/libarchive/pull/2897","label":"secalert@redhat.com"}],"tags":["nvd"],"epss":0.00305,"epssPercentile":0.23468,"ingestedAt":"2026-08-21T14:17:57.332Z","slug":"CVE-2026-4426","body":"## Overview\n\nA flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition.\n\n## Affected\n\n- `libarchive`\n- `hardened_images`\n- `openshift_container_platform = 4.0`\n- `enterprise_linux = 6.0`\n- `enterprise_linux = 7.0`\n- `enterprise_linux = 8.0`\n- `enterprise_linux = 9.0`\n- `enterprise_linux = 10.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}